Buggy code:
public class HTTPHC3Impl extends HTTPHCAbstractImpl { private static final Logger log = LoggingManager . getLoggerForClass ( ) ; private static final int RETRY_COUNT = JMeterUtils . getPropDefault ( "httpclient3.retrycount" , 0 ) ; private static final String HTTP_AUTHENTICATION_PREEMPTIVE = "http.authentication.preemptive" ; private static final boolean canSetPreEmptive ; private static final ThreadLocal < Map < HostConfiguration , HttpClient > > httpClients = new ThreadLocal < Map < HostConfiguration , HttpClient > > ( ) { @ Override protected Map < HostConfiguration , HttpClient > initialValue ( ) { } } ; volatile HttpClient savedClient ; private volatile boolean resetSSLContext ; protected HTTPHC3Impl ( HTTPSamplerBase base ) { } @ Override protected HTTPSampleResult sample ( URL url , String method , boolean areFollowingRedirect , int frameDepth ) { String urlStr = url . toString ( ) ; HTTPHC3Impl . log . debug ( ( "Start<seq2seq4repair_space>:<seq2seq4repair_space>sample<seq2seq4repair_space>" + urlStr ) ) ; HTTPHC3Impl . log . debug ( ( "method<seq2seq4repair_space>" + method ) ) ; HttpMethodBase httpMethod = null ; HTTPSampleResult res = new HTTPSampleResult ( ) ; res . setMonitor ( isMonitor ( ) ) ; res . setSampleLabel ( urlStr ) ; res . setHTTPMethod ( method ) ; res . setURL ( url ) ; res . sampleStart ( ) ; try { if ( method . equals ( POST ) ) { httpMethod = new PostMethod ( urlStr ) ; } else if ( method . equals ( PUT ) ) { httpMethod = new PutMethod ( urlStr ) ; } else if ( method . equals ( HEAD ) ) { httpMethod = new HeadMethod ( urlStr ) ; } else if ( method . equals ( TRACE ) ) { httpMethod = new TraceMethod ( urlStr ) ; } else if ( method . equals ( OPTIONS ) ) { httpMethod = new OptionsMethod ( urlStr ) ; } else if ( method . equals ( DELETE ) ) { httpMethod = new EntityEnclosingMethod ( urlStr ) { @ Override public String getName ( ) { return HTTPConstants . DELETE ; } } ; } else if ( method . equals ( GET ) ) { httpMethod = new GetMethod ( urlStr ) ; } else if ( method . equals ( PATCH ) ) { httpMethod = new EntityEnclosingMethod ( urlStr ) { @ Override public String getName ( ) { return HTTPConstants . PATCH ; } } ; } else { <START_BUG> throw new IllegalArgumentException ( ( "Unexpected<seq2seq4repair_space>method:<seq2seq4repair_space>" + method ) ) ; <END_BUG> } final CacheManager cacheManager = getCacheManager ( ) ; if ( ( cacheManager != null ) && ( GET . equalsIgnoreCase ( method ) ) ) { if ( cacheManager . inCache ( url ) ) { res . sampleEnd ( ) ; res . setResponseNoContent ( ) ; res . setSuccessful ( true ) ; return res ; } } setDefaultRequestHeaders ( httpMethod ) ; HttpClient client = setupConnection ( url , httpMethod , res ) ; savedClient = client ; if ( method . equals ( POST ) ) { String postBody = sendPostData ( ( ( PostMethod ) ( httpMethod ) ) ) ; res . setQueryString ( postBody ) ; } else if ( ( ( method . equals ( PUT ) ) || ( method . equals ( PATCH ) ) ) || ( method . equals ( DELETE ) ) ) { String putBody = sendEntityData ( ( ( EntityEnclosingMethod ) ( httpMethod ) ) ) ; res . setQueryString ( putBody ) ; } int statusCode = client . executeMethod ( httpMethod ) ; final InetAddress localAddr = client . getHostConfiguration ( ) . getLocalAddress ( ) ; if ( localAddr != null ) { httpMethod . addRequestHeader ( HEADER_LOCAL_ADDRESS , localAddr . toString ( ) ) ; } res . setRequestHeaders ( getConnectionHeaders ( httpMethod ) ) ; InputStream instream = httpMethod . getResponseBodyAsStream ( ) ; if ( instream != null ) { instream = new CountingInputStream ( instream ) ; try { Header responseHeader = httpMethod . getResponseHeader ( HEADER_CONTENT_ENCODING ) ; if ( ( responseHeader != null ) && ( ENCODING_GZIP . equals ( responseHeader . getValue ( ) ) ) ) { InputStream tmpInput = new GZIPInputStream ( instream ) ; res . setResponseData ( readResponse ( res , tmpInput , ( ( int ) ( httpMethod . getResponseContentLength ( ) ) ) ) ) ; } else { res . setResponseData ( readResponse ( res , instream , ( ( int ) ( httpMethod . getResponseContentLength ( ) ) ) ) ) ; } } finally { JOrphanUtils . closeQuietly ( instream ) ; } } res . sampleEnd ( ) ; res . setSampleLabel ( httpMethod . getURI ( ) . toString ( ) ) ; res . setResponseCode ( Integer . toString ( statusCode ) ) ; res . setSuccessful ( isSuccessCode ( statusCode ) ) ; res . setResponseMessage ( httpMethod . getStatusText ( ) ) ; String ct = null ; Header h = httpMethod . getResponseHeader ( HEADER_CONTENT_TYPE ) ; if ( h != null ) { ct = h . getValue ( ) ; res . setContentType ( ct ) ; res . setEncodingAndType ( ct ) ; } res . setResponseHeaders ( getResponseHeaders ( httpMethod ) ) ; if ( res . isRedirect ( ) ) { final Header headerLocation = httpMethod . getResponseHeader ( HEADER_LOCATION ) ; if ( headerLocation == null ) { throw new IllegalArgumentException ( "Missing<seq2seq4repair_space>location<seq2seq4repair_space>header" ) ; } try { res . setRedirectLocation ( ConversionUtils . sanitizeUrl ( new URL ( headerLocation . getValue ( ) ) ) . toString ( ) ) ; } catch ( Exception e ) { HTTPHC3Impl . log . error ( ( ( ( "Error<seq2seq4repair_space>sanitizing<seq2seq4repair_space>URL:" + ( headerLocation . getValue ( ) ) ) + ",<seq2seq4repair_space>message:" ) + ( e . getMessage ( ) ) ) ) ; } }

Fix:
throw new IllegalArgumentException ( ( ( "Unexpected<seq2seq4repair_space>method:<seq2seq4repair_space>'" + method ) + "'" ) ) ;